ocr, 1899.] MAMMALS. 95 
Microtus montanus (Peale). 
Not obtained on Shasta, but collected at Fall River Lake in August 
by W. K. Fisher. In August, 1883, seven specimens were collected in 
the grassy meadows at Sisson Tavern by C. H. Townsend. 
Microtus mordax (Merriam). Mountain Vole. 
Common in suitable moist places throughout the Canadian and Hud- 
sonian zones, particularly in the heather meadows a little below timber- 
line, where, though chiefly nocturnal, they were sometimes seen in the 
daytime. Their burrows abound in the heather beds, especially along 
the overhanging banks of streams, and are so large that some of them 
were at first mistaken for those of Microtus arvicoloides, a species which 
does not occur on Shasta. They were not found in the dry forest. 
Seventy-four specimens were collected, of which only six were obtained 
at Wagon Camp. Near Sisson Tavern R. T. Fisher caught fifteen along 
“the wet and bushy banks of a long ditch.” They probably reach 
Sisson not from Shasta, but from Mount Eddy, in the Scott Mountains, 
near the foot of which Sisson Tavern is situated. Still, it is possible 
that the two colonies are connected along some of the few cold streams 
that traverse the Transition zone slopes of Shasta. 
Evotomys mazama Merriam. Mountain Evotomys. 
Fairly common in moist places in the Shasta fir forests of the Cana- 
dian zone, where nineteen specimens were obtained. Ten were col- 
lected in Mud Creek Canyon near the mouth of Clear Creek (altitude 
6,700 feet); seven along Squaw Creek from 6,700 up to 7,700 feet; one 
at the head of Panther Creek at 7,700 feet, und one at Wagon Camp at 
5,700 feet. They were usually caught in traps set under logs in damp 
or wet places. 
Phenacomys orophilus Merriam, JLemming-Mouse. 
Rare and local, judging from the results of our trapping. Only three 
specimens were obtained—all in the heather meadows along the upper 
part of Squaw Creek, where they were caught August 7, 10, and 12 by 
Walter K. Fisher. 
Thomomys monticola Allen. Sierra Pocket Gopher. 
Abundant throughout the boreal slopes of the mountain, from the lower 
part of the Canadian zone to above timberline. In the dark forests of 
Shasta firs their mounds were seen wherever there was enough small 
vegetation to furnish food, and were commonest along the streams und 
about the edges of marshy places, where plant life is abundant and luxu- 
riant. Above the line of continuous timber their mounds were noticed 
on many of the pumice slopes between the altitudes of 8,000 and 9,000 
feet. Above the head of Squaw Creek a small colony was found at an 
altitude of 8,300 feet, and another between 8,900 and 9,000 feet. On 
the east side of Mud Creek Canyon they were seen at 8,800 feet, and on 
the west side at 8,900 feet. On our trip around the mountain near 
